The standard setup is to unzip the wysiwygit directory in your site's home directory. This way any of your site's files may be edited. In this case you would access wysiwygit in your browser with http://<your site URL>/wysiwygit
An alternative is to unzip the wysiwygit directory in a subdirectory on your site. In this case only files and subdirectories within that subdirectory may be edited.
The web server for your site will need to have read and write access to your web site directories.
The initial administrative user has user name "admin" and password "admin". Be sure to change this! Log in to wysiwygit, the use the left-most icon in the wysiwygit header to access "Admin - users/passwords".
In the wysiwygit/config.php file you can specify a few options – directories off-limits to uploads/downloads, divs that cannot be edited, and whether whole pages can be edited or just divs within a page.
Steps to editing:
Backup/restore. Wysiwygit saves previous versions of edited pages. These previous versions can be reviewed and restored. Use the left-most icon in the wysiwygit header to access "View/restore backups".
File and image uploads. The "Editing controls" panel includes tools for links and images. There is a "Browse server" option to select where uploaded files and images will be placed.
Editing conflicts. Wysiwygit will not allow two users to edit the same page at the same time.